Since you raise your own mice, you should order a breeding pair of rats online and start feeding rats! My bp is only 2 and a half months old. He is 146 grams and eating rat pups that are about 30 grams every 5 days just fine! I know thats over 15% of his weight but he seem to eat them just fine and he usually is waiting out of his hide on feeding days and grabs it in seconds!